CN113718249A - Self-adaptive growth method of corrosion-resistant film of layered double hydroxide on surface of reinforcement in concrete - Google Patents

Self-adaptive growth method of corrosion-resistant film of layered double hydroxide on surface of reinforcement in concrete Download PDF

Info

Publication number
CN113718249A
CN113718249A CN202111092914.1A CN202111092914A CN113718249A CN 113718249 A CN113718249 A CN 113718249A CN 202111092914 A CN202111092914 A CN 202111092914A CN 113718249 A CN113718249 A CN 113718249A
Authority
CN
China
Prior art keywords
concrete
reactant
layered double
corrosion
resistant film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111092914.1A
Other languages
Chinese (zh)
Inventor
洪舒贤
王琰帅
董必钦
邢锋
房国豪
张媛媛
陈沛榆
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen University
Original Assignee
Shenzhen University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen University filed Critical Shenzhen University
Priority to CN202111092914.1A priority Critical patent/CN113718249A/en
Publication of CN113718249A publication Critical patent/CN113718249A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention provides a self-adaptive growth method of a layered double-metal hydroxide corrosion-resistant film on the surface of a reinforcement in concrete, belonging to the technical field of concrete material repair. The method comprises the following steps: and pouring the concrete, the steel bar, the divalent metal reactant and the trivalent metal reactant, and then carrying out self-adaptive growth to obtain the layered double-metal hydroxide corrosion-resistant film. Aiming at the problem that the corrosion-resistant film of the layered double hydroxide partially falls off in practical application such as the transportation process of the reinforcing steel bar or the stirring process of the reinforcing steel bar and the concrete, the reactant capable of preparing the layered double hydroxide is added when the concrete and the reinforcing steel bar are poured, and then the reactant is subjected to self-adaptive growth, and the reactant (comprising a divalent metal reactant and a trivalent metal reactant) can grow the layered double hydroxide on the surface of the reinforcing steel bar or a position where the corrosion-resistant film of the layered double hydroxide is partially separated, so that the reinforcing steel bar is better protected from being corroded, and the service life of the structure of the infrastructure is prolonged.

Description

Self-adaptive growth method of corrosion-resistant film of layered double hydroxide on surface of reinforcement in concrete
Technical Field
The invention relates to the technical field of concrete material repair, in particular to a self-adaptive growth method of a layered double-metal hydroxide corrosion-resistant film on the surface of a reinforcing steel bar in concrete.
Background
China has abundant marine resources, and the utilization and development of the marine resources are not separated from the construction of offshore infrastructure. The reinforced concrete has the characteristics of high strength and good toughness, and becomes a preferred structural form of the offshore infrastructure. Because of the harsh corrosive environment of the ocean, the reinforced concrete is destroyed before the design service life of the reinforced concrete is reached, and the development of ocean resources is seriously influenced. Although the layered double metal hydroxide (LDH) corrosion-resistant film growing on the surface of the steel bar in situ can solve the defect that the organic coating is easy to age, the corrosion resistance of the steel bar is improved. However, the corrosion-resistant film of the layered double hydroxide can locally fall off in the process of transporting the steel bars or stirring the steel bars and the concrete, the corrosion protection effect is lost, and the purpose of protecting the steel bars cannot be achieved.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for adaptively growing a layered double hydroxide corrosion-resistant film on a surface of a reinforcement in concrete. The method can grow the corrosion-resistant film of the layered double hydroxide in situ again at the damaged part of the steel bar film with the layered double hydroxide film, thereby protecting the steel bar from being corroded.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a self-adaptive growth method of a layered double-metal hydroxide corrosion-resistant film on the surface of a reinforcement in concrete, which comprises the following steps:
and pouring the concrete, the steel bar, the divalent metal reactant and the trivalent metal reactant, and then carrying out self-adaptive growth to obtain the layered double-metal hydroxide corrosion-resistant film.
Preferably, the molar ratio of the divalent metal element in the divalent metal reactant to the trivalent metal element in the trivalent metal reactant is 1: 1.
Preferably, the divalent metal reactant is a divalent metal salt or a divalent metal oxide.
Preferably, the divalent metal in the divalent metal reactant comprises Mg2+、Co2+、Ca2+、Cu2+And Zn2+One or more of (a).
Preferably, the trivalent metal reactant is a trivalent metal salt or a trivalent metal oxide.
Preferably, the trivalent metal in the trivalent metal reactant comprises Al3+、Fe3+And Cr3+One or more of (a).
Preferably, the temperature of the self-adaptive growth is 40-150 ℃.
Preferably, the total mass of the divalent metal reactant and the trivalent metal reactant is 0-5% of the mass of the concrete, and the total mass of the divalent metal reactant and the trivalent metal reactant is not 0.
Preferably, the casting comprises the steps of:
mixing the divalent metal reactant and the trivalent metal reactant to obtain a mixture;
and after the mixture is coated on the surface of the steel bar, pouring the mixture and the concrete.
Preferably, the surface of the steel bar is provided with a broken layered double hydroxide corrosion-resistant film.
The invention provides a self-adaptive growth method of a layered double-metal hydroxide corrosion-resistant film on the surface of a reinforcement in concrete, which comprises the following steps: and pouring the concrete, the steel bar, the divalent metal reactant and the trivalent metal reactant, and then carrying out self-adaptive growth to obtain the layered double-metal hydroxide corrosion-resistant film.
Aiming at the problem that the corrosion-resistant film of the layered double hydroxide partially falls off in the process of transporting or stirring the reinforcing steel bars, the reactant capable of preparing the layered double hydroxide is added when the concrete and the reinforcing steel bars are poured, the reactant is subjected to self-adaptive growth under the alkaline action in the concrete, and the reactant (comprising a divalent metal reactant and a trivalent metal reactant) can grow the layered double hydroxide on the surface of the reinforcing steel bars or at the position where the corrosion-resistant film of the layered double hydroxide is partially separated, so that the reinforcing steel bars are better protected from corrosion, and the structural life of the offshore infrastructure is prolonged.
Drawings
FIG. 1 is a schematic flow diagram of the self-adaptive growth of layered double metal hydroxide (LDH) membranes on the surface of steel bars in concrete according to the present invention;
FIG. 2 is a schematic representation of the use of the present invention with a layered double hydroxide reactant for coating.
Detailed Description
The invention provides a self-adaptive growth method of a layered double-metal hydroxide corrosion-resistant film on the surface of a reinforcement in concrete, which comprises the following steps:
and pouring the concrete, the steel bar, the divalent metal reactant and the trivalent metal reactant, and then carrying out self-adaptive growth (high-temperature environment) to obtain the layered double-metal hydroxide corrosion-resistant film.
Fig. 1 is a schematic flow chart of the self-adaptive growth of a layered double metal hydroxide (LDH) membrane on the surface of a steel bar in concrete.
In the present invention, the molar ratio of the divalent metal element in the divalent metal reactant and the trivalent metal element in the trivalent metal reactant is preferably 1: 1.
In the present invention, the divalent metal reactant is preferably a divalent metal salt or a divalent metal oxide.
In the present invention, the divalent metal in the divalent metal reactant preferably includes Mg2+、Co2+、Ca2+、Cu2+And Zn2+One or more of (a).
In the present invention, the divalent metal salt is preferably magnesium nitrate, cobalt nitrate, calcium nitrate, zinc nitrate or copper nitrate.
In the present invention, the divalent metal oxide is preferably magnesium oxide, cobalt oxide, calcium oxide, zinc oxide, or copper oxide.
In the present invention, the trivalent metal reactant is preferably a trivalent metal salt or a trivalent metal oxide.
In the present invention, the trivalent metal in the trivalent metal reactant preferably includes Al3+、Fe3+And Cr3+One or more of (a).
In the present invention, the trivalent metal salt is preferably aluminum nitrate, iron nitrate or chromium nitrate.
In the present invention, the trivalent metal oxide is preferably alumina, iron oxide or chromium oxide.
In the invention, the temperature of the self-adaptive growth is preferably 40-150 ℃, more preferably 40-80 ℃, the reinforced concrete member obtained after the concrete, the steel bar, the divalent metal reactant and the trivalent metal reactant are poured is in the self-adaptive growth (high-temperature environment), the external temperature is conducted to the inside, and when the temperature reaches the reaction condition capable of generating the layered double hydroxide, the layered double hydroxide film can be grown on the surface of the steel bar in situ again under the high temperature and the alkaline action in the concrete of the divalent metal reactant and the trivalent metal reactant near the steel bar, so that the defects are filled, and the protection effect is enhanced.
In the present invention, the adaptive growth is preferably steam curing.
In the present invention, the total mass of the divalent metal reactant and the trivalent metal reactant is preferably 0 to 5% of the mass of the concrete, and the total mass of the divalent metal reactant and the trivalent metal reactant is not 0, more preferably 1%, 2%, 3%, 4%, or 5%.
In the present invention, the casting process preferably further comprises water, sand and stones, and the amount of the water, sand and stones used in the present invention is not particularly limited, and can be performed in a manner well known to those skilled in the art.
In the present invention, one way of the pouring is preferably to directly stir the concrete, the steel bar, the divalent metal reactant and the trivalent metal reactant.
In the present invention, another mode of the casting preferably includes the steps of:
mixing the divalent metal reactant and the trivalent metal reactant to obtain a mixture;
and after the mixture is coated on the surface of the steel bar, pouring the mixture and the concrete.
The present invention is not particularly limited to the specific manner of coating, and may be applied in a manner known to those skilled in the art.
In the present invention, the surface of the reinforcing steel bar is preferably provided with a broken layered double hydroxide corrosion-resistant film.
In order to further illustrate the present invention, the following describes in detail the adaptive growth method of the corrosion-resistant film of layered double hydroxide on the surface of a reinforcement bar in concrete provided by the present invention with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
In the preparation of the reinforced concrete with the damaged layered double hydroxide anti-corrosion film, magnesium nitrate and aluminum nitrate are doped in the stirring process of the concrete and reinforcing steel bars, the molar ratio of magnesium element in the magnesium nitrate to aluminum element in the aluminum nitrate is 1:1, and the total mass of the magnesium nitrate and the aluminum nitrate is 1 percent of the mass of the concrete. After the high-temperature curing at 150 ℃ is finished for 24h, the corrosion potential of the obtained sample in a sodium chloride solution with the mass fraction of 3.5% is tested by an electrochemical method, and the corrosion potential is-598.2 mV.
Example 2
The same as in example 1, except that the total mass of magnesium nitrate and aluminum nitrate was 2% of the mass of the concrete.
The corrosion potential of the obtained sample in a sodium chloride solution with the mass fraction of 3.5 percent is tested by an electrochemical method, and the corrosion potential is-563.7 mV.
Example 3
The same as in example 1, except that the total mass of magnesium nitrate and aluminum nitrate was 3% of the mass of the concrete.
The corrosion potential of the obtained sample in a sodium chloride solution with the mass fraction of 3.5 percent is tested by an electrochemical method, and the corrosion potential is-489.2 mV.
Example 4
The same as in example 1, except that the total mass of magnesium nitrate and aluminum nitrate was 4% of the mass of the concrete.
And testing the corrosion potential of the obtained sample in a sodium chloride solution with the mass fraction of 3.5% by using an electrochemical method, wherein the corrosion potential is-465.9 mV.
Example 5
The same as in example 1, except that the total mass of magnesium nitrate and aluminum nitrate was 5% of the mass of the concrete.
And testing the corrosion potential of the obtained sample in a sodium chloride solution with the mass fraction of 3.5% by an electrochemical method, wherein the corrosion potential is-449.3 mV.
Example 6
The procedure of example 5 was repeated, except that the mixture obtained by mixing magnesium nitrate, aluminum nitrate and water was sprayed on the damaged portion before the steel bar with the layered double hydroxide anticorrosive film was poured with concrete, and then the concrete was poured. The schematic diagram is shown in fig. 2.
The corrosion potential of the obtained sample in a sodium chloride solution with the mass fraction of 3.5% is tested by an electrochemical method, the corrosion potential is-398.4 mV, the corrosion potential of the sample obtained in example 6 is higher than that of the sample obtained in example 5, and the result shows that the sample obtained in example 5 can more effectively enable reactants to grow in situ at the position where the corrosion-resistant film is damaged and repair the film.
Comparative example 1
The same as in example 1, except that the total mass of magnesium nitrate and aluminum nitrate was 0% of the mass of the concrete.
The corrosion potential of the obtained sample in a sodium chloride solution with the mass fraction of 3.5 percent is tested by an electrochemical method, and the corrosion potential is-658.2 mV, which indicates that the sample does not have the anti-corrosion effect.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention.

Claims (10)

1. A self-adaptive growth method of a layered double hydroxide corrosion-resistant film on the surface of a reinforcement in concrete is characterized by comprising the following steps:
and pouring the concrete, the steel bar, the divalent metal reactant and the trivalent metal reactant, and then carrying out self-adaptive growth to obtain the layered double-metal hydroxide corrosion-resistant film. When concrete and steel bars are poured, a divalent metal reactant and a trivalent metal reactant are added, and then under a certain condition, the reactants can grow a layered double-metal hydroxide corrosion-resistant film on the surface of the steel bars in situ.
2. The adaptive growth method according to claim 1, wherein the molar ratio of the divalent metal element in the divalent metal reactant to the trivalent metal element in the trivalent metal reactant is 1: 1.
3. An adaptive growth method according to claim 1 or 2, wherein the divalent metal reactant is a divalent metal salt or a divalent metal oxide.
4. An adaptive growth method according to claim 1 or 2, wherein the divalent metal in the divalent metal reactant comprises Mg2+、Co2+、Ca2+、Cu2+And Zn2+One or more of (a).
5. An adaptive growth method according to claim 1 or 2, wherein the trivalent metal reactant is a trivalent metal salt or a trivalent metal oxide.
6. An adaptive growth method according to claim 1 or 2, wherein the trivalent metal in the trivalent metal reactant is included in a trivalent metal packageIncluding Al3+、Fe3+And Cr3+One or more of (a).
7. The adaptive growth method according to claim 1, wherein the temperature of the adaptive growth is 40-150 ℃.
8. An adaptive growth method according to claim 1 or 2, wherein the total mass of the divalent metal reactant and the trivalent metal reactant is 0 to 5% of the mass of the concrete, and the total mass of the divalent metal reactant and the trivalent metal reactant is not 0.
9. The adaptive growth method of claim 1, wherein the pouring comprises the steps of:
mixing the divalent metal reactant and the trivalent metal reactant to obtain a mixture;
and after the mixture is coated on the surface of the steel bar, pouring the mixture and the concrete.
10. The adaptive growth method according to claim 1, wherein the surface of the steel bar is provided with a damaged corrosion-resistant film of layered double hydroxide.
CN202111092914.1A 2021-09-17 2021-09-17 Self-adaptive growth method of corrosion-resistant film of layered double hydroxide on surface of reinforcement in concrete Pending CN113718249A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111092914.1A CN113718249A (en) 2021-09-17 2021-09-17 Self-adaptive growth method of corrosion-resistant film of layered double hydroxide on surface of reinforcement in concrete

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111092914.1A CN113718249A (en) 2021-09-17 2021-09-17 Self-adaptive growth method of corrosion-resistant film of layered double hydroxide on surface of reinforcement in concrete

Publications (1)

Publication Number Publication Date
CN113718249A true CN113718249A (en) 2021-11-30

Family

ID=78684217

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111092914.1A Pending CN113718249A (en) 2021-09-17 2021-09-17 Self-adaptive growth method of corrosion-resistant film of layered double hydroxide on surface of reinforcement in concrete

Country Status (1)

Country Link
CN (1) CN113718249A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008129034A1 (en) * 2007-04-20 2008-10-30 Euro Support Catalyst Group Bv Hydrotalcite-like layered double hydroxide (ldh) composition and process of making same
CN107032673A (en) * 2017-04-11 2017-08-11 南华大学 A kind of chemical resistance of concrete high-strength and high-ductility concrete and preparation method thereof
CN110523415A (en) * 2019-09-03 2019-12-03 浙江天地环保科技有限公司 Copper and iron layered double hydroxide, copper and iron layered double hydroxide/C-base composte material and its preparation method and application
CN112301344A (en) * 2020-09-04 2021-02-02 深圳大学 Method for in-situ preparation of layered double hydroxide passive film

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008129034A1 (en) * 2007-04-20 2008-10-30 Euro Support Catalyst Group Bv Hydrotalcite-like layered double hydroxide (ldh) composition and process of making same
CN107032673A (en) * 2017-04-11 2017-08-11 南华大学 A kind of chemical resistance of concrete high-strength and high-ductility concrete and preparation method thereof
CN110523415A (en) * 2019-09-03 2019-12-03 浙江天地环保科技有限公司 Copper and iron layered double hydroxide, copper and iron layered double hydroxide/C-base composte material and its preparation method and application
CN112301344A (en) * 2020-09-04 2021-02-02 深圳大学 Method for in-situ preparation of layered double hydroxide passive film

Similar Documents

Publication Publication Date Title
CN101619459B (en) Sacrificial anode capable of quickly activating aluminum alloy
JP5849868B2 (en) Steel material with excellent corrosion resistance
Sandberg Critical evaluation of factors affecting chloride initiated reinforcement corrosion in concrete
CN109592948A (en) A kind of corrosion resistance concrete and its preparation process
CN104556819A (en) Marine engineering concrete corrosion inhibitor
CN111592258A (en) Marine engineering concrete strengthening material and preparation method and application thereof
KR101800550B1 (en) Coated steel material and method for producing the same
CN109824288A (en) A kind of cement-based material chlorine-solidifying agent and preparation method thereof
CN115403291A (en) Harbor concrete corrosion-resistant reinforcing agent and preparation method thereof
CN113968710B (en) Anti-corrosion marine concrete with self-repairing function and preparation method and application thereof
CN113718249A (en) Self-adaptive growth method of corrosion-resistant film of layered double hydroxide on surface of reinforcement in concrete
CN110423289A (en) The preparation method of modified natural chitin polymeric phosphoric acid sodium cathode corrosion inhibitor
CN101844889A (en) Composite organic reinforcing steel bar rust inhibitor for reinforced concrete
CN101255291B (en) Marine reinforced concrete anticorrosion paint and preparation method thereof
CN106007473A (en) Complexing agent for concrete and preparation method thereof
CN110128567A (en) The method for preparing environmentally friendly reinforcing steel bar corrosion inhibitor using natural biomass chitin high polymer
CN110357467A (en) A kind of modification magnesium sulfate cement and preparation method thereof that resistant to sea water corrodes
CN103204653A (en) Seawater-resistant electrochemical corrosion concrete
CN207711526U (en) A kind of trip fishing corrosion-resistant plate body of marine light
CN110615632B (en) Composite steel bar corrosion inhibitor for marine environment and application thereof
GB2199045A (en) Seawater-corrosion-resistant non-magnetic steel materials
Melchers et al. Predicting corrosion for life estimation of ocean and coastal steel infrastructure
JP4882259B2 (en) Hydrated hardened body with rebar having excellent salt resistance
al-Swaidani Inhibition effect of natural pozzolan and zinc phosphate baths on reinforcing steel corrosion
Yeomans Laboratory and field performance of galvanized steel in concrete

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20211130

WD01 Invention patent application deemed withdrawn after publication